TWI338155B

TWI338155B - Projection lens

Info

Publication number: TWI338155B
Application number: TW96132558A
Authority: TW
Inventors: Chun Ling Lin
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2007-08-31
Filing date: 2007-08-31
Publication date: 2011-03-01
Also published as: TW200909862A

Description

1338155 099年 07月六、發明說明：【發明所屬之技術領域】 _1] 本發明涉及投影技術’特別涉及一種投影鏡頭。【先前技術】 [0002]當前，數位光處理（Digital Light Processing, DLP)投影儀及採用液晶光閥（Light valve)之液晶顯示 (Liquid Crystal Display，LCD)投影儀、石夕晶 (Liquid Crystal on Silicon，LCoS)投影儀已取代陰極射管（Cathode Ray Tube ’CRT)投影儀成為市場主流產品。以往，CRT投影儀可通過電性補償 (Electrically compensation)修正投影鏡頭之像差 ’而DLP，LCD及LCoS投影儀並不具備電性補償能力，因此’要求應用於DLP，LCD或LCoS投影儀之投影鏡頭具有光學修正像差之能力，以獲得高品質投影畫面。 [0003]另一方面’隨著半導體技術之發展，DLP，LCD及LCoS投景夕儀採用之空間光調製器（Spatial light modulator ，SLM)，包括數位微鏡晶片（Digitai cro-m i rror device)、液晶顯示面板（LCD panel)及矽晶晶片（LC〇s chip) ’在提高像素之同時，朝小型化方向發展，以此滿足消費者對投影畫面品質之要求及便攜性之要求。對應地’投影鏡頭需提高解析度、縮小尺寸，以配合SLM組成高投影品質、小尺寸之投影儀。 [0004]再有’投影鏡頭還需具有足夠之視場角（wide angle)，以在較狹小之場合（短投影距離）獲得較大畫幅（Large screen) ° 096132558 表單編號A0101 第3頁/共31頁 0993252430-0 1338155 099年07月14日 [0005] 然而，投影鏡頭之設計存在如下矛盾：提高解析度，意味需採用更多之鏡片或尚成本之非球面玻璃鏡片消除各種像差（Aberration) ’投影鏡頭全長（投影鏡頭第—個光學面到SLM表面之距離）變長，成本增加。增大視場角，往往需要縮短投影鏡頭放大端（近螢幕端）之鏡群（負光焦度）之有效焦距，提高負光焦度。然而，鏡群之有效焦距較短將產生嚴重之單色像差，特別係畸變 (Distortion) ’投影鏡頭解析度受影響。另外，採用非球面鏡片（特別係非球面玻璃鏡片）可有效修正像差，減少投影鏡頭所採用鏡片之數量，然而，成本增加。【發明内容】 [〇〇〇6] 有鑒於此，有必要提供一種高:解析度、小尺寸之投影鏡頭。 [0007] —種投影鏡頭，其從放大端至縮小端依次包括：具有負光焦度之第一鏡群及具有正光焦度之第二鏡群。該投影鏡頭滿足條件式： [0008] -2. 5<Fl/F<-2. 1 088 ； [0009] 1. 3<F2/F<1. 4383。 [0010] 其中，FI，F2及F分別為5玄第一鏡群、該第二鏡群及該投影鏡頭之有效焦距。 [〇〇11]條件式·· -2.5<F1/F<-1.5用於限制該第一鏡群之光焦度 (1 /F1 )，以獲知足夠之視場角，並控制單色像差。條件式：1.3<F2/F<1.5用於限制該第二鏡群之光焦度，以有效平衡該第一鏡群產生之單色像差，並限制投影鏡頭全 096132558 表單編號A0101 第4頁/共31頁 0993252430-0 1338155 _一一 . -. 099年07月14日修正^^頁長0 【實施方式】 [0012] 請參閱圖1(示意圖，鏡片參數請參具體實施例），本發明實施例之投影鏡頭100從放大端至縮小端（近SLM端）依次包括具有負光焦度之第一鏡群10及具有正光焦度之第二鏡群20。 [0013] 作為範例’本實施例之投影鏡頭1〇〇應用於LCoS投影儀，投影時，S L Μ (石夕晶晶片，圖未示）調製之投影訊號光自 SLM表面99投射入投影鏡頭1〇〇，依次經第二鏡群2〇及第一鏡群10，投射於螢幕（圖未示）上便可得到投影畫面。具體地’ LCoS投影儀投影時，SLM表面99投射出之投影訊號光依次經過偏振片98(P〇larizer)、半波片 97(Retarder)及偏振分光（p〇larizing Beam Split_ ter，PBS)棱鏡組合96後進入投影鏡頭10〇 β [0014] 為得到高解析度、小尺寸之投影鏡頭1〇〇，投影鏡頭1〇() 滿足條件式： [0015] (1) -2. 5<F1/F<-1. 5 ; [0016] (2) 1. 3<F2/F<1. 5。剛ρ’π，咖1^分別為第_鏡群1()、第二鏡群2〇及投影鏡頭100之有效焦距。 [0018] 條件式⑴給出第—鏡群1G之光焦度Π/Π)與投影鏡頭 100之光焦度（1/F)之關係，以獲得理想之視場角並控制單色像差(在第二鏡群20修正之範圍内MW較大， 096132558 有利於增大視場角及縮小投影鏡頭全長表單編號A0I01 第5頁/共31 故限定 0993252430-0 1338155 [0019] [0020] [0021] [0022] [0023] [0024] [0025] [0026] [0027] 096132558 099年07月I4日接正替换貧声p> 2.5，考慮到F1/F過大，導致第一鏡群1〇負光焦 "，大’將產生嚴重之單色像差，特別係畸變，為將畸蚤控制在可修正之範圍内，故另限定F U公丨.5。 p件式（2)給出第二鏡群2〇之光焦度（1/F2)與投影鏡頭 00之光焦度（1/F)之關係，以有效平衡第一鏡群1〇產生之單色像差，並控制投影鏡頭全長。一方面，F2/F較大 ’利於滿足投影鏡頭縮小端遠心（Telecentric)成像要长（如此’螢幕可在-段距離範圍内接收到清晰投影晝面 )，而F2/F較小，利於縮短投影鏡頭全長；另一方面，為 :致平衡第-鏡群Η產生之單色像差，避免修正過度或 ^正不及，需限定F2/F範圍，故办良定3<F2/F<1. 5。優選地，投影鏡頭100滿足條件式^ (3) Lb/F>l. 6。1338155 099 07. Description of the invention: [Technical field to which the invention pertains] _1] The present invention relates to projection technology' particularly relates to a projection lens. [Prior Art] [0002] Currently, a digital light processing (DLP) projector and a liquid crystal display (LCD) projector using a liquid crystal light valve (Liquid Crystal on) Silicon, LCoS) projectors have replaced cathode ray tube (Cathode Ray Tube 'CRT) projectors as the mainstream product. In the past, CRT projectors can correct the aberration of the projection lens by electrical compensation. DLP, LCD and LCoS projectors do not have electrical compensation capability, so 'required for DLP, LCD or LCoS projectors. The projection lens has the ability to optically correct aberrations to obtain a high quality projection picture. [0003] On the other hand, with the development of semiconductor technology, DLP, LCD and LCoS are used in the spatial light modulator (SLM), including digital micro mirrors (Digitai cro-m i rror device) ), liquid crystal display panel (LCD panel) and crystal chip (LC〇s chip) 'in the direction of miniaturization while increasing the pixel, in order to meet consumer demand for projection picture quality and portability requirements. Correspondingly, the projection lens needs to be improved in resolution and reduced in size to match the SLM to form a projector with high projection quality and small size. [0004] Further, the 'projection lens needs to have a sufficient wide angle to obtain a larger screen in a narrower case (short projection distance) ° 096132558 Form No. A0101 Page 3 / Total Page 31 0993252430-0 1338155 July 14, 2008 [0005] However, the design of the projection lens has the following contradiction: increasing the resolution means using more lenses or a cost of aspherical glass lenses to eliminate various aberrations (Aberration) ) 'The total length of the projection lens (the distance from the first optical surface of the projection lens to the surface of the SLM) becomes longer and the cost increases. Increasing the angle of view often requires shortening the effective focal length of the mirror group (negative power) of the enlarged end of the projection lens (near screen end) to increase the negative power. However, the short effective focal length of the mirror group will produce severe monochromatic aberrations, especially the distortion of the projection lens. In addition, the use of aspherical lenses (especially aspherical glass lenses) can effectively correct aberrations and reduce the number of lenses used in projection lenses, however, the cost increases. SUMMARY OF THE INVENTION [〇〇〇6] In view of the above, it is necessary to provide a projection lens of high resolution and small size. [0007] A projection lens includes, in order from the amplification end to the reduction end, a first mirror group having a negative power and a second mirror group having a positive power. The projection lens satisfies the conditional expression: [0008] - 2. 5 < Fl / F < - 2. 1 088; [0009] 1. 3 < F2 / F < 1.383. [0010] wherein, FI, F2, and F are respectively the 5th first mirror group, the second mirror group, and the effective focal length of the projection lens. [〇〇11] Conditional expression···2.5<F1/F<-1.5 is used to limit the power of the first mirror group (1 /F1) to know a sufficient angle of view and control the monochrome image difference. Conditional formula: 1.3 < F2 / F < 1.5 is used to limit the power of the second mirror group to effectively balance the monochromatic aberration generated by the first mirror group, and limit the projection lens full 096132558 Form No. A0101 No. 4 Page / Total 31 pages 0993252430-0 1338155 _一一. -. July 14, 2004 correction ^^ page length 0 [Embodiment] [0012] Please refer to Figure 1 (schematic, lens parameters please refer to the specific example), The projection lens 100 of the embodiment of the present invention includes, in order from the amplification end to the reduction end (near SLM end), a first mirror group 10 having a negative refractive power and a second mirror group 20 having a positive power. [0013] As an example, the projection lens 1 of the present embodiment is applied to an LCoS projector. When projecting, a projection signal light modulated by SL 石 (Shi Xijing wafer, not shown) is projected from the SLM surface 99 into the projection lens 1 Then, the second mirror group 2〇 and the first mirror group 10 are sequentially projected onto a screen (not shown) to obtain a projection screen. Specifically, when the LCoS projector is projected, the projection signal light projected by the SLM surface 99 passes through the polarizer 98 (P〇larizer), the half-wave plate 97 (Retarder), and the polarization splitting (P〇larizing Beam Split_ ter) (PBS) prism. After the combination 96 enters the projection lens 10〇β [0014] In order to obtain a high-resolution, small-sized projection lens 1〇〇, the projection lens 1〇() satisfies the conditional expression: [0015] (1) -2. 5<F1/ F<-1. 5; [0016] (2) 1. 3<F2/F<1. Just ρ'π, the coffee 1^ is the effective focal length of the _ mirror group 1 (), the second mirror group 2 〇, and the projection lens 100, respectively. [0018] Conditional Formula (1) gives the relationship between the power of the first lens group 1G/Π and the power of the projection lens 100 (1/F) to obtain an ideal angle of view and control the monochromatic aberration. (The MW is larger in the range corrected by the second mirror group 20, and 096132558 is advantageous for increasing the angle of view and reducing the total length of the projection lens. Form number A0I01 Page 5 of 31 Therefore, 0993252430-0 1338155 [0019] [0020] [0023] [0023] [0023] [0023] [0027] [0027] 096132558 099 July 1st, I4 replace the poor sound p > 2.5, considering the F1/F is too large, resulting in the first mirror group 1〇 Negative optical coke ", large 'will produce severe monochromatic aberrations, especially distortion, in order to control the distortion within the correctable range, so the other is limited to FU 丨.5. p-form (2) gives The relationship between the power of the second mirror group 2/F2 and the power of the projection lens 00 (1/F) to effectively balance the monochromatic aberration generated by the first mirror group 1 and control the projection The full length of the lens. On the one hand, the larger F2/F is good for satisfying the telephoto end of the projection lens. Telegraphic imaging is long (so that the screen can receive a clear projection surface within a range of distances). F2/F is small, which is good for shortening the total length of the projection lens. On the other hand, it is: to balance the monochromatic aberration generated by the first-mirror group, to avoid over-correction or correction, and to limit the F2/F range. 3) The projection lens 100 satisfies the conditional expression ^(3) Lb/F> 1.6.

.、中，Lb為投影鏡頭後焦距，即第二鏡群2〇最後一個光面到SLM表面99之距離。關係式（3)限定後焦距Lb ’以獲得足夠之空間設置偏振# _ ο 〇、半波片97及PBS棱鏡組合96等LCoS投影儀組件。更加優選地，投影鏡頭1〇〇還滿足關係式：(幻〇· 24<D12/F<0. 5。其中，D12為第一鏡群10與第二鏡群2〇之轴上間距（第一 ’疋群10與第二鏡群2〇相對兩個表面裁得之光軸長度）。條件式（4)限定第一鏡群1〇與第二鏡群2〇之間空氣隙之寬度以縮短投影鏡頭全長，並提供足夠之調焦空間（第一表軍編珑A0101 第6頁/共31頁 0993252430-0 1338155 » * 099年07月14日後正替换百鏡頭10與第二鏡頭20之相對移動量）。具體地，較小之 D12/F，有利於縮短投影鏡頭全長，故限定D12/F<0. 5，為預留空間調焦，限定D12/F>0.2《。 [0028] 具體地，第一鏡群10從放大端至縮小端依次包括具有負光焦度之第一鏡片11、具有正光焦度之第二鏡片12、具有負光焦度之第三鏡片13及具有正光焦度之第四鏡片14 ，以合理分配第一鏡群10之光焦度。 [0029] • 為有效修正單色像差，優選地，第一鏡群10包括至少一個非球面鏡片（至少一個表面採用非球面鏡）。考慮到球面鏡片具有價格優勢，可降低投影鏡頭100之成本，本實施例之第一鏡群10採用一個)非球面鏡片。更優選地，在工作溫度允許之情況下，如_用發光二極體（Light emitting diode)作為LCoS投影儀光源，本實施例之第一鏡群10採用一個塑膠材料製成之非球面鏡片，以進一步降低投影鏡頭100之成本。 [0030] • 類似地，第二鏡群20從放大端至縮小端依次包括具有正尤焦度之第五鏡片21、具着貪光焦度之第六鏡片22、具有正光焦度之第七鏡片23及具有正光焦度之第八鏡片24 〇 [0031] 優選地，第二鏡群20包括至少一個非球面鏡，更優地，第二鏡群20包括一個非球面鏡。同樣，在工作溫度允許之情況下，第二鏡群20採用一個塑膠非球面鏡片。 [0032] 更加具體地，投影鏡頭100還包括一個設置於第五鏡片21 與第六鏡片22之間之光闌95(aperture stop)，以限制 096132558 表單編號A0101 第7頁/共31頁 0993252430-0 1338155 099年07月14日修正替换苜 [0033] [0034] [0035] [0036] [0037] [0038] [0039] [0040] [0041] [0042] [0043] 096132558 Λ = 松外光線由第六透鏡22進入第五透鏡21而產生較嚴重之畸變及場曲。另外，光闌95使得經過第六透鏡22之光線更加對稱’利於修正蓉差（coma)。另一方面，為修正色差（chromatic aberration)，還限定第一鏡群10之至少一個鏡片滿足關係式： (5) vdl>55; (6) nd>l.5; 其中’乂(11及1^分別為(1光（波長為587.6奈米，下同）在第一鏡群10之至少一個鏡片之阿貝數（abbe number)及折射率第二鏡群20之至少一鏡片滿足關；滅式: (7) vd2>60 。其中，vd2為d光在第二鏡群20之至少一個鏡片之阿貝數〇以下結合圖2至圖1 0，以具體實施例進一步說明投影鏡頭 100。以鏡片表面中心為原點，光軸為X軸，鏡片表面之非球面面型運算式為： ck1 其中，C為鏡面表面中心之曲率，k係二次曲面係數， ^ 為從光袖到鏡片表面之1^度’ g ft1表示表單編號A0101 第8頁/共31頁 0993252430-0 1338155 |099年0?月14日後正替換頁對A i h i累加，i為自麸私，A; Α β . t *、、、 A i為第i階之非球面面型係數 _]另外，約定fn〇為投影鏡頭100之光圈數，2ω為投影鏡頭 100之視％角，R為對應表面之曲率半徑，D為對應表面到後一個表面（像側）之轴上距離（兩個表面載得光轴之長度 )，Nd為對應鏡片（濾光片）對d光之折射率，vd為d光在對應鏡片（濾光片）之阿貝數，En表示10n(n為整數）。 [0045] 實施例1 [0046] 實施例1之投影鏡頭100滿足表1及表2所列之條件，且 F = 21. 58 毫来（millimeter，mm )，Fl=-38. 85 mm， F2 = 30. 42 5mm，Fw =2. 45，2ω = 54. 7°，第二鏡片 12及第七鏡片23採用塑膠非球面鏡片。 [0047]表 1 表面 R (mm) D (mm) Nd vd 第一鏡片放大端表面 56.088 1.5 1. 589 61.135 第一鏡片縮小端表面 23.041 2, 111 第二鏡片放大端表面 66.179 4. 045 1.6073 26. 65 第二鏡片 -39.229 2. 771 - 一表單編號A0101 第9頁/共31頁 0993252430-0In the middle, Lb is the back focal length of the projection lens, that is, the distance from the last surface of the second mirror group 2 to the SLM surface 99. The relation (3) defines the back focal length Lb' to obtain a sufficient space to set the LCoS projector assembly such as the polarization #_ ο 〇 , the half wave plate 97, and the PBS prism combination 96. More preferably, the projection lens 1〇〇 also satisfies the relationship: (phantom 24 <D12/F<0.5. wherein D12 is the on-axis spacing of the first mirror group 10 and the second mirror group 2〇 (the first a '疋 group 10 and a second mirror group 2〇 are opposite to the two surfaces of the optical axis length.) Conditional expression (4) defines the width of the air gap between the first mirror group 1〇 and the second mirror group 2〇 to Shorten the full length of the projection lens and provide enough focusing space (First Stage Editor A0101 Page 6 of 31 0993252430-0 1338155 » * Replace the 100 lens 10 and the second lens 20 after July 14th, 099 Relatively moving amount). Specifically, the smaller D12/F is beneficial to shorten the total length of the projection lens, so that D12/F<0.5 is defined, and the space is adjusted, and D12/F>0.2" is defined. [0028] Specifically, the first mirror group 10 includes, in order from the enlarged end to the reduced end, a first lens 11 having a negative power, a second lens 12 having a positive power, a third lens 13 having a negative power, and a positive light. The fourth lens 14 of the power is used to properly distribute the power of the first mirror group 10. [0029] • To effectively correct the monochromatic aberration, preferably, A mirror group 10 includes at least one aspherical lens (at least one surface adopts an aspherical mirror). Considering the price advantage of the spherical lens, the cost of the projection lens 100 can be reduced, and the first mirror group 10 of the embodiment adopts an aspherical lens. . More preferably, in the case where the operating temperature permits, such as using a light emitting diode as the light source of the LCoS projector, the first mirror group 10 of the embodiment adopts an aspherical lens made of a plastic material. To further reduce the cost of the projection lens 100. [0030] Similarly, the second mirror group 20 includes, in order from the enlarged end to the reduced end, a fifth lens 21 having a positive focus, a sixth lens 22 having a glare power, and a seventh having a positive power. Lens 23 and eighth lens 24 having positive power [0031] Preferably, second mirror group 20 includes at least one aspherical mirror, and more preferably, second mirror group 20 includes an aspherical mirror. Similarly, the second mirror group 20 employs a plastic aspherical lens if the operating temperature permits. [0032] More specifically, the projection lens 100 further includes an aperture stop disposed between the fifth lens 21 and the sixth lens 22 to limit 096132558 Form No. A0101 Page 7 / Total 31 Page 0993252430- 0 1338155 07 07 07 003 003 003 003 [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ The sixth lens 22 enters the fifth lens 21 to generate more severe distortion and curvature of field. In addition, the aperture 95 makes the light passing through the sixth lens 22 more symmetrical 'to facilitate correction of the coma. On the other hand, in order to correct the chromatic aberration, at least one lens of the first mirror group 10 is also defined to satisfy the relationship: (5) vdl >55; (6) nd >l.5; where '乂 (11 and 1) ^ respectively (1 light (wavelength is 587.6 nm, the same below) at least one lens of the first mirror group 10 abbe number and at least one lens of the refractive index second mirror group 20 meets; (7) vd2 > 60. wherein vd2 is the d-light in the Abbe number of at least one lens of the second mirror group 20, in conjunction with FIG. 2 to FIG. 10, the projection lens 100 is further described by way of a specific embodiment. The center of the lens surface is the origin, the optical axis is the X-axis, and the aspherical surface of the lens surface is: ck1 where C is the curvature of the center of the mirror surface, k is the quadric coefficient, ^ is from the light sleeve to the lens surface 1^degree' g ft1 means form number A0101 page 8 / total 31 page 0993252430-0 1338155 | 099 year 0 month 14th after the replacement page is added to A ihi, i is self-breast, A; Α β . t *, , , A i is the aspherical surface coefficient of the i-th order _] In addition, the convention fn 〇 is the number of apertures of the projection lens 100, and 2ω is a projection The viewing angle of the lens 100, R is the radius of curvature of the corresponding surface, D is the on-axis distance from the corresponding surface to the latter surface (image side) (the length of the optical axis carried by the two surfaces), and Nd is the corresponding lens (filtered The refractive index of d light, vd is the Abbe number of d light in the corresponding lens (filter), and En represents 10n (n is an integer). [0046] Embodiment 1 [0046] Projection lens of Embodiment 1 100 meets the conditions listed in Tables 1 and 2, and F = 21. 58 millimeters (millimeter, mm), Fl = -38.85 mm, F2 = 30. 42 5mm, Fw = 2. 45, 2ω = 54 7°, the second lens 12 and the seventh lens 23 are made of plastic aspherical lenses. [0047] Table 1 Surface R (mm) D (mm) Nd vd First lens magnification end surface 56.088 1.5 1. 589 61.135 First lens Reduced end surface 23.041 2, 111 Second lens enlarged end surface 66.179 4. 045 1.6073 26. 65 Second lens -39.229 2. 771 - One form number A0101 Page 9 of 31 0993252430-0

096132558 1338155 099年07月14日按正替換苜縮小端表面 1 第三鏡片放大端表面 -79.672 1.5 1. 571 50.8 第三鏡片縮小端表面 13-178 3. 771 第四鏡片放大端表面 -35.77 3.156 1. 744 44.786 丨 | 第四鏡片縮小端表面 -24.669 5. 28 第五鏡片放大端表面 43. 254 3. 481 1. 589 61.135 ! 第五鏡片縮小端表面 -19. 618 0.15 光闌表面無窮大 9. 834 - - 第六鏡片放大端表面 -25.202 1.5 1.8467 23. 78 第六鏡片縮小端表 32.223 3. 46 — 表單編號A0101 第10頁/共31頁 0993252430-0 096132558 1338155096132558 1338155 On July 14, 099, replace the 端 reduction end surface 1 The third lens enlargement end surface -79.672 1.5 1. 571 50.8 The third lens reduction end surface 13-178 3. 771 The fourth lens magnification end surface -35.77 3.156 1. 744 44.786 丨 | Fourth lens reduced end surface - 24.669 5. 28 Fifth lens enlarged end surface 43. 254 3. 481 1. 589 61.135 ! Fifth lens reduced end surface -19. 618 0.15 Optical surface infinity 9 834 - - Sixth lens magnification end surface - 25.202 1.5 1.8467 23. 78 Sixth lens reduction end table 32.223 3. 46 - Form No. A0101 Page 10 of 31 0993252430-0 096132558 1338155

099年07月14日修正替换頁面第七鏡片放大端表面 - 4 9. 8 7.1 1.5247 56.26 第七鏡片縮小端表面 -16.129 0. 246 第八鏡片放大端表面 72.513 7. 946 1.6968 55. 53 第八鏡片縮小端表面 -29.765 2. 15 偏振片放大端表面無窮大 22 1.6477 33.848 偏振片縮小端表面無窮大 2 一一半波片放大端表面無窮大 0.7 1.5184 61.7 表2 表面表面非球面面型參數第二鏡片放大端表面 k=-10.97392; A4=l.82963E-5; A6=-9.26848E-8; A8=5.59189E-10; 表單編號A0101 第11頁/共31頁 0993252430-0 096132558 IS38155 099年07月14日修正替換頁 A10=-l.98742E-12 • 第二鏡片縮小端表面 k=-22·43766; A4=3.49E-6; A6=2.72E-8; A8=7.02E-11; A10=-7.80E-13 第七鏡片放大端表面 k=-79.16789; A4=-l.08162 E-4; A6=9.00E-07; A8=-9.89E-9; A10=3.47E-11 第七鏡片縮小端表面 k=0.4065924; A4=1.07E-5; A6=8.96E-9; A8=2.79E-10; A10=-2.67E-12 實施例1之投影鏡頭100之球差特性曲線、場曲特性曲線及畸變之特性曲線分別如圖2、圖3及圖4所示。圖2中，曲線f，d及C分別為f光（波長為486. 1奈米，下同）、d光 < 及c光（波長為656. 3奈米，下同）經投影鏡頭100之球差特性曲線（下同）。可見，實施例1之投影鏡頭100對可見光（400-700奈米）產生之球差被控制在-〇. lmm~〇. 1mm間。圖3中，曲線t及s為子午場曲（Tangential field curvature)特性曲線及弧矢場曲（Sagittal field curvature )特性曲線（下同）。可見，子午場曲值及弧矢場曲值被控制在-〇. lmin~0, 1111111間。圖4中，曲線為畸變特性曲線（下同）。可見，畸變量被控制在—2%〜2%間综前，儘管投影鏡頭1〇〇具有較大之視場角及較小尺寸， 096132558 表單蝙號A0101 第丨2頁/共31頁 0993252430-0 1338155 * ·*Modified on July 14, 099 Replacement page No. 7 lens enlarged end surface - 4 9. 8 7.1 1.5247 56.26 Seventh lens reduced end surface - 16.129 0. 246 Eighth lens enlarged end surface 72.513 7. 946 1.6968 55. 53 Eighth Lens reduction end surface -29.765 2. 15 Polarization plate magnification end surface infinity 22 1.6477 33.848 Polarizer reduction end surface infinity 2 One-half wave plate amplification end surface infinity 0.7 1.5184 61.7 Table 2 Surface surface aspherical surface parameters Second lens magnification End surface k=-10.97392; A4=l.82963E-5; A6=-9.26848E-8; A8=5.59189E-10; Form No. A0101 Page 11 of 31 0993252430-0 096132558 IS38155 July 14, 2004 Daily correction replacement page A10=-l.98742E-12 • Second lens reduction end surface k=-22·43766; A4=3.49E-6; A6=2.72E-8; A8=7.02E-11; A10=- 7.80E-13 The seventh lens magnifying end surface k=-79.16789; A4=-l.08162 E-4; A6=9.00E-07; A8=-9.89E-9; A10=3.47E-11 End surface k=0.4065924; A4=1.07E-5; A6=8.96E-9; A8=2.79E-10; A10=-2.67E-12 The spherical aberration characteristic curve and field of the projection lens 100 of the embodiment 1 The characteristic curves of the curved characteristic curve and the distortion are shown in Fig. 2, Fig. 3 and Fig. 4, respectively. In Fig. 2, the curves f, d, and C are respectively f light (wavelength is 486.1 nm, the same below), d light < and c light (wavelength is 656.3 nm, the same below) through the projection lens 100 The spherical aberration characteristic curve (the same below). It can be seen that the spherical aberration generated by the projection lens 100 of Embodiment 1 on visible light (400-700 nm) is controlled between -1. lmm~〇. 1 mm. In Fig. 3, the curves t and s are the Tangential field curvature characteristic curve and the Sagittal field curvature characteristic curve (the same applies hereinafter). It can be seen that the meridional field curvature value and the arc field curvature value are controlled between -〇.lmin~0, 1111111. In Fig. 4, the curve is a distortion characteristic curve (the same below). It can be seen that the distortion variable is controlled between -2%~2%, although the projection lens 1〇〇 has a larger angle of view and a smaller size, 096132558 Form bat number A0101 Page 2/31 pages 0993252430- 0 1338155 * ·*

099年07月14日核正雜頁其產生之球差、場曲及畸變卻被控制（修正）在較小之範圍内。 [0050] 實施例2 [0051]實施例2之投影鏡頭ι〇〇滿足表3及表4所列之條件，且 F = 20. 57nm，Fl=-43. 378mm，F2 = 29.585mm， FNo=2. 44，2 ω=56.98。，第二鏡片12及第七鏡片23採用塑膠非球面鏡片。 [0052]表 3 [0053] 表面 R (mm) D (mm) Nd vd 第一鏡片放大端表面 56.37951 1 ·5 1.5163 64.142 第一鏡片縮小端表面 19.45174 2.784273 第二鏡片放大端表面 67.52031 4.063589 1.6073 26. 65 第二鏡片縮小端表面 35.39937 1.838138 第三鏡片放大端表面 -115.634 1.5 1.5225 59.8354 表單編號A0101 第13頁/共31頁 0993252430-0 096132558 1338155 099年07月14日修正替換頁第三鏡片縮小端表面 12.79318 4.061006 _ 1 • • 第四鏡片放大端表面 33.31014 3.632139 1.6204 60.2896 第四鏡片縮小端表面 22.97251 5.274921 | 第五鏡片放大端表面 47.65653 3.315928 1 - 1. 589 61.135 第五鏡片縮小端表面 19.51972 0.15 光闌表面無窮大 8.758488 - - 第六鏡片放大端表面 24.89886 1. 5 1.8467 23. 78 第六鏡片縮小端表面 30.70857 3.418172 第七鏡片放大端表面 50.35514 7. 1 1.5247 56.26 第七鏡片 - 1.041066 — - 表單編號A0101 第14頁/共31頁 0993252430-0 096132558 1338155 4 099年07月14日修正替換頁縮小端表面 15.63497 第八鏡片放大端表面 84.05907 7.926621 1.6968 55. 53 第八鏡片縮小端表面 28.60263 2. 1 35659 偏振片放大端表面無窮大 22 1.6477 33.848 偏振片縮小端表面無窮大 2 一半波片放大端表面無窮大 0.7 1.5184 61. 7 表4On July 14, 099, the spherical aberration, curvature of field and distortion produced by it were controlled (corrected) to a smaller extent. [0050] Embodiment 2 [0051] The projection lens of Example 2 satisfies the conditions listed in Tables 3 and 4, and F = 20. 57 nm, Fl = -43. 378 mm, F2 = 29.585 mm, FNo = 2. 44, 2 ω = 56.98. The second lens 12 and the seventh lens 23 are made of a plastic aspherical lens. [0052] Table 3 [0053] Surface R (mm) D (mm) Nd vd First lens enlarged end surface 56.37951 1 · 5 1.5163 64.142 First lens reduced end surface 19.45174 2.784273 Second lens enlarged end surface 67.52031 4.063589 1.6073 26. 65 Second lens reduced end surface 35.39937 1.838138 Third lens enlarged end surface -115.634 1.5 1.5225 59.8354 Form number A0101 Page 13 of 31 0993252430-0 096132558 1338155 Correction replacement page of the third lens Reduced end surface 12.79318 4.061006 _ 1 • • Fourth lens magnification end surface 33.31014 3.632139 1.6204 60.2896 Fourth lens reduction end surface 22.97251 5.274921 | Fifth lens magnification end surface 47.65653 3.315928 1 - 1. 589 61.135 Fifth lens reduction end surface 19.51972 0.15 Optical surface Infinity 8.758488 - - Sixth lens magnification end surface 24.89886 1. 5 1.8467 23. 78 Sixth lens reduction end surface 30.70857 3.418172 Seventh lens magnification end surface 50.35514 7. 1 1.5247 56.26 Seventh lens - 1.041066 — - Form No. A0101 No. 14 Page / Total 31 Pages 099325 2430-0 096132558 1338155 4 Revised replacement page on July 14, 099 Reduced end surface 15.63497 Eighth lens enlarged end surface 84.05907 7.926621 1.6968 55. 53 Eighth lens reduced end surface 28.60263 2. 1 35659 Polarizing plate magnification end surface infinity 22 1.6477 33.848 Polarizing plate shrinking end surface infinity 2 Half wave plate magnifying end surface infinity 0.7 1.5184 61. 7 Table 4

[0054] 表面表面非球面面型參數第二鏡片放大端表面 k=-10.17326; A4=l.74E-5; A6=-l.02E-7; A8=6.22E-10; A10=-2.15E-12 第三鏡片縮小端表面 k=-19.16988; A4=l.81E-6; A6=3.9E-8; A8=3.7E-11; A10=-6.46E-13 096132558 表單編號A0101 第15頁/共31頁 0993252430-0 1538155 實施例2之投影鏡頭1 〇〇之球.差特..性曲轉、場曲特性曲線及畸變之特性曲線分別如圖5、圖6及7所示· »可見，實施例2之投影鏡頭1〇〇對可見光產圭之球差被控制在一 0. lmm~0. 1mm間，子午場曲值及弧矢場曲值被控制在_ 0. lmm~0. lmm間，畸變量被控制在-2%〜2%間。綜前，儘管投影鏡頭100視場角，尺寸縮小，其產生之球差、場曲及畸變卻被控制在較小之範圍内。 [0055] [0056] 099年07月14日修正替換頁第七鏡片放大端表面 k=-91.33926; Α4=-1·21802E-4; Α6=1.14E-6; A8=-l.34E-8; A10=5.7E-11 第七鏡片縮小端表面 k=0.3093345; Α4=8·74E-6; A6=-4.76E-9; A8 = 3.04E~10 ； A10 = -3‘ 85E-12 實施例3 實施例3之投影鏡頭1〇〇滿足表5及表6所列之條件，且 F = 21. 2mm，Fl=-47mm，F2 = 31. 0 2mm，FN〇=2. 46，2ω = 55.57 ° ’第一鏡片11及第七鏡片23採用塑膠非球面鏡片° [0057] 表5 [0058] 表面 R (mm) D (ram) Nd 表單編號A0101 第16頁/共31頁 096132558 vd 0993252430-0 1338155 ，[0054] Surface surface aspherical surface type parameter second lens magnification end surface k=-10.17326; A4=l.74E-5; A6=-l.02E-7; A8=6.22E-10; A10=-2.15E -12 third lens reduced end surface k=-19.16988; A4=l.81E-6; A6=3.9E-8; A8=3.7E-11; A10=-6.46E-13 096132558 Form No. A0101 Page 15/ A total of 31 pages 0993252430-0 1538155 Projection lens of Example 2 The ball of the ball. The characteristics of the curve, the curvature of field curvature and the distortion are shown in Figure 5, Figure 6 and Figure 7 respectively. The distance between the meridional field curvature and the sagittal field curvature is controlled at _ 0. lmm~0. lmm, the projection lens of the embodiment 2 is controlled to be in a range of 0. lmm~0. The distortion variable is controlled between -2% and 2%. In the meantime, although the projection lens 100 has a field of view and the size is reduced, the spherical aberration, curvature of field and distortion generated by the projection lens 100 are controlled to a small extent. [0056] The correction replacement page of the seventh lens on July 14, 099, k=-91.33926; Α4=-1·21802E-4; Α6=1.14E-6; A8=-l.34E-8 A10=5.7E-11 Seventh lens reduced end surface k=0.3093345; Α4=8·74E-6; A6=-4.76E-9; A8 = 3.04E~10; A10 = -3' 85E-12 Example 3 The projection lens 1 of Example 3 satisfies the conditions listed in Tables 5 and 6, and F = 21. 2 mm, Fl = -47 mm, F2 = 31. 0 2 mm, FN 〇 = 2. 46, 2 ω = 55.57 ° 'The first lens 11 and the seventh lens 23 are made of a plastic aspherical lens. [0057] Table 5 [0058] Surface R (mm) D (ram) Nd Form No. A0101 Page 16 of 31 096132558 vd 0993252430-0 1338155,

099年07月14日梭正替換頁第一鏡片放大端表面 58.051 2.41 1.5247 56. 26 第一鏡片縮小端表面 11.667 2.202 第二鏡片放大端表面 21.439 3.004 1.806 33.2694 第二鏡片縮小端表面 103.82 2. 701 第三鏡片放大端表面 -21.595 1. 501 1.6175 48.0786 第三鏡片縮小端表面 20.408 2. 524 第四鏡片放大端表面 30.179 3.302 1.6742 51.7521 第四鏡片縮小端表面 -51.502 6. 5 第五鏡片放大端表 41.495 2. 383 1.6987 48.9334 表單編號A0101 第17頁/共31頁 0993252430-0 096132558 T538155 099年07月14日修正替换頁面第五鏡片縮小端表面 -40.266 0.918 光闌表面無窮大 11.36 _ - 第六鏡片放大端表面 -19.698 1,5 1.8467 23, 78 第六鏡片縮小端表面 73.743 1.214 第七鏡片放大端表面 153.785 10 1. 5247 56. 26 第七鏡片縮小端表面 -20.171 0. 2 第八鏡片放大端表面 47.879 7. 871 1.6178 60.4578 第八鏡片縮小端表面 -34.109 2 偏振片放大端表面無窮大 22 1.6477 33.8482 偏振片縮無窮大 1 - 表單編號A0101 第18頁/共31頁 0993252430-0 096132558 1338155 ________ I 099年月14日梭正替換頁小端表面 — 半波片放無窮大 0.7 ~~~ 1.5184 61. 7 大端表面 ------— 表6July 14, 099 Shuttle replacement page First lens magnification end surface 58.051 2.41 1.5247 56. 26 First lens reduction end surface 11.667 2.202 Second lens magnification end surface 21.439 3.004 1.806 33.2694 Second lens reduction end surface 103.82 2. 701 Third lens enlarged end surface - 21.595 1. 501 1.6175 48.0786 Third lens reduced end surface 20.408 2. 524 Fourth lens enlarged end surface 30.179 3.302 1.6742 51.7521 Fourth lens reduced end surface - 51.502 6. 5 Fifth lens enlarged end table 41.495 2. 383 1.6987 48.9334 Form No. A0101 Page 17 of 31 0993252430-0 096132558 T538155 Correction Replacement Page on July 14, 2008 Fifth Face Reduced End Surface -40.266 0.918 Optical Surface Infinity 11.36 _ - Sixth Lens Zoom End surface -19.698 1,5 1.8467 23, 78 Sixth lens reduced end surface 73.743 1.214 Seventh lens enlarged end surface 153.785 10 1. 5247 56. 26 Seventh lens reduced end surface -20.171 0. 2 Eighth lens enlarged end surface 47.879 7. 871 1.6178 60.4578 Eighth lens reduction end surface-3 4.109 2 Polarizing plate amplifying end surface infinity 22 1.6477 33.8482 Polarizing plate infinity 1 - Form number A0101 Page 18 of 31 0993252430-0 096132558 1338155 ________ I On the 14th of October, the shuttle is replacing the small end surface - half wave plate Put infinity 0.7 ~~~ 1.5184 61. 7 Big end surface ------ - Table 6

----- 表面 -----_ —------- 表面非球面面型參數第一鏡片放大端表面 k=2.9896; A4=l.42E-5; A6=-8.47E-8; A8=3.87E-10； A10=7.12E-13 第一鏡片縮小端表面 k=-0.8105889; A4=2.33E-5; A6=-5.69E-9; AB=-1.99E-9； A10=2.06E-11 第七鏡片放大端表面 k=-748.1059； A4=2.68E-5; A6=-l.04E-7; A8=l.76E-09； A10=-4.39E-12 第七鏡片縮小端表面 k=-0.4196788； — A4=1.26E-5; A6=9.62E-8; A8=-l.61E-10； A10=3.23E-12 -------- 實施例3之投影鏡頭1〇〇之球差特性曲線、場曲特性曲線及畸變之特性曲線分別如圖8、圖9及圖10所示》可見， 096丨32558 表單編號Α0101 第】9頁/共3丨頁 0993252430-0 1338155 099年07月14日修正替換頁實施例3之投影鏡頭100對可見光產生之球差被控制在-0. 1 mm~ 0. 1 mm間，子午場曲值及孤矢場曲值被控制在-0. lmm〜0. lmm間，畸變量被控制在-2°/2%間。综前，儘管投影鏡頭100視場角，尺寸縮小，其產生之球差、場曲及畸變卻被控制（修正）在較小之範圍内。 [0060] 條件式·· -2. 5<F1/F<-1. 5用於限制該第一鏡群之光焦度 (1/F1)，以獲得足夠之視場角，並控制單色像差。條件式：1.3<F2/F<1. 5用於限制該第二鏡群之光焦度，以有效平衡該第一鏡群產生之單色像差，並限制投影鏡頭全長。：..· [0061] 综上所述，本發明確已符合發明專利要件，爰依法提出專利申請。惟，以上所述者僅為本發明之較佳實施方式，舉凡熟悉本案技藝之人士，於援依本案發明精神所作之等效修飾或變化，皆應包含於以下之申請專利範圍内【圖式簡單說明】 [0062] 圖1為本發明實施例之投影鏡頭之系統構成示意圖。 [0063] 圖2為本發明實施例1之投影鏡頭之球差（S p h e r i c a 1 aberration)特性曲線圖。 [0064] 圖3為本發明實施例1之投影鏡頭之場曲（F i e Id curvature)特性曲線圖。 [0065] 圖4為本發明實施例1之投影鏡頭之畸變特性曲線圖。 [0066] 圖5為本發明實施例2之投影鏡頭之球差特性曲線圖。 0993252430-0 096132558 表單編號A0101 第20頁/共31頁 1338155 099年07月14日核正替換頁 [0067] 圖6為本發明實施例2之投影鏡頭之場曲特性曲線圖。 [0068] 圖7為本發明實施例2之投影鏡頭之畸變特性曲線圖。 [0069] 圖8為本發明實施例3之投影鏡頭之球差特性曲線圖。 [0070] 圖9為本發明實施例3之投影鏡頭之場曲特性曲線圖。 [0071] 圖10為本發明實施例3之投影鏡頭之畸變特性曲線圖。【主要元件符號說明】 [0072] 成像鏡頭：100 [0073] 第六鏡片：2 2 [0074] 第一鏡群：10 [0075] 第七鏡片：23 [0076] 第一鏡片：11 [0077] 第八鏡片：24 [0078] 第二鏡片：12 [0079] SLM表面：99 [0080] 第三鏡片：13 [0081] 偏振片：98 [0082] 第四鏡片：1 4 [0083] 半波片：97 [0084] 第二鏡群：20 [0085] PBS棱鏡組合：96 096132558 表單編號A0101 第21頁/共31頁 0993252430-0 1338155 099年07月14日按正替換15： [0086] 第五鏡片·· 21 [0087] 光闌：95 096132558 表單編號A0101 第22頁/共31頁----- Surface-----_-------- Surface aspherical surface parameters First lens magnification end surface k=2.9896; A4=l.42E-5; A6=-8.47E- 8; A8=3.87E-10; A10=7.12E-13 First lens reduced end surface k=-0.8105889; A4=2.33E-5; A6=-5.69E-9; AB=-1.99E-9; A10 =2.06E-11 The surface of the seventh lens magnifying end k=-748.1059; A4=2.68E-5; A6=-l.04E-7; A8=l.76E-09; A10=-4.39E-12 seventh lens Reduced end surface k=-0.4196788; — A4=1.26E-5; A6=9.62E-8; A8=-l.61E-10; A10=3.23E-12 -------- Example 3 The spherical aberration characteristic curve, field curvature characteristic curve and distortion characteristic curve of the projection lens 1〇〇 are as shown in Fig. 8, Fig. 9 and Fig. 10 respectively, 096丨32558 Form No. Α0101第9页/Total 3丨0993252430-0 1338155 Revised replacement page on July 14, 099 The projection lens 100 of Example 3 is controlled to have a spherical aberration of visible light between -0.1 mm and 0.1 mm, meridional field curvature and orbital curvature value. It is controlled between -0. lmm~0. lmm, the distortion variable is controlled between -2 ° / 2%. In the meantime, although the projection lens 100 has a field of view and the size is reduced, the resulting spherical aberration, field curvature and distortion are controlled (corrected) to a small extent. [0060] Conditional Formula···2. 5<F1/F<-1. 5 is used to limit the power of the first mirror group (1/F1) to obtain a sufficient angle of view, and to control monochrome Aberration. Conditional formula: 1.3 < F2 / F < 1.5 is used to limit the power of the second mirror group to effectively balance the monochromatic aberration generated by the first mirror group and to limit the length of the projection lens. :..· [0061] In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and those skilled in the art will be able to include the equivalent modifications or variations of the invention in the spirit of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS [0062] FIG. 1 is a schematic diagram showing the system configuration of a projection lens according to an embodiment of the present invention. 2 is a graph showing a spherical aberration (S p h e r i c a 1 aberration) of a projection lens according to Embodiment 1 of the present invention. 3 is a graph showing a field curvature of a projection lens according to Embodiment 1 of the present invention. 4 is a distortion characteristic diagram of a projection lens according to Embodiment 1 of the present invention. 5 is a graph showing spherical aberration characteristics of a projection lens according to Embodiment 2 of the present invention. 0993252430-0 096132558 Form No. A0101 Page 20 of 31 1338155 July 14th, 1999, Nuclear Replacement Page [0067] FIG. 6 is a graph showing the field curvature characteristics of the projection lens according to Embodiment 2 of the present invention. 7 is a distortion characteristic diagram of a projection lens according to Embodiment 2 of the present invention. 8 is a graph showing spherical aberration characteristics of a projection lens according to Embodiment 3 of the present invention. 9 is a graph showing a field curvature characteristic of a projection lens according to Embodiment 3 of the present invention. 10 is a distortion characteristic diagram of a projection lens according to Embodiment 3 of the present invention. [Main Component Symbol Description] [0072] Imaging Lens: 100 [0073] Sixth Lens: 2 2 [0074] First Mirror Group: 10 [0075] Seventh Lens: 23 [0076] First Lens: 11 [0077] Eighth Lens: 24 [0078] Second Lens: 12 [0079] SLM Surface: 99 [0080] Third Lens: 13 [0081] Polarizing Plate: 98 [0082] Fourth Lens: 1 4 [0083] Half-wave plate :97 [0084] Second Mirror Group: 20 [0085] PBS Prism Combination: 96 096132558 Form No. A0101 Page 21 / Total 31 Page 0993252430-0 1338155 099 July 14 Press Positive 15: [0086] Fifth Lens·· 21 [0087] Light: 95 096132558 Form No. A0101 Page 22 of 31

0993252430-00993252430-0

Claims

1338155 099年07月；U日梭正替换頁七、申請專利範圍： 1 . 一種投影鏡頭，其從放大端縮小端依次包括：具有負光焦度之第一鏡群及具有正光焦度之第二鏡群；該投影鏡頭滿足條件式： -2.5<Fl/F<-2.1088; 1.3<F2/F<1.4383 ；其中，FI，F2及F分別為該第一鏡群、該第二鏡群及該投影鏡頭之有效焦距。1338155 099 July; U Risuo is replacing page 7. Patent application scope: 1. A projection lens, which includes, in order from the enlarged end, a first mirror group having a negative power and a positive power The second lens group; the projection lens satisfies the conditional expression: -2.5<Fl/F<-2.1088;1.3<F2/F<1.4383; wherein FI, F2 and F are the first mirror group and the second mirror, respectively Group and the effective focal length of the projection lens.

2 .如申請專利範圍第1項所述之投影鏡頭，其中，該投影鏡頭還滿足條件式： Lb/F>l.6 ；其中，Lb為該投影鏡頭之後焦距。 3 .如申請專利範圍第1項所述之投影鏡頭，其中，該投影鏡頭還滿足條件式： 0.24<D12/F<0. 5 ；其中，D12為該第一鏡群與該第二鏡群之軸上間距。2. The projection lens of claim 1, wherein the projection lens further satisfies a conditional expression: Lb/F >1.6; wherein Lb is a focal length of the projection lens. 3. The projection lens of claim 1, wherein the projection lens further satisfies a conditional expression: 0.24 < D12/F <0.5; wherein D12 is the first mirror group and the second mirror The spacing on the axis of the group.

4. 如申請專利範圍第1項所述之投影鏡頭，其中，該第一鏡群從放大到縮小端依次包括：具有負光焦度之第一鏡片、具有正光焦度之第二鏡片、具有負光焦度之第三鏡片及具有正光焦度之第四鏡片。 5. 如申請專利範圍第1項所述之投影鏡頭，其中，該第一鏡群包括至少一個非球面鏡片。 6 .如申請專利範圍第1項所述之投影鏡頭，其中，該第一鏡群包括至少一個塑膠非球面鏡片。 7.如申請專利範圍第1項所述之投影鏡頭，其中，該第一鏡 096132558 表單編號A0101 第23頁/共31頁 0993252430-0 1338155 099年07月14日按正替换頁群包括至少一個鏡片滿足條件式： vd>55； nd>l.5 ；其中，vd為波長為587.6奈米之光線在該至少一個鏡片之阿貝數，nd為該至少一個鏡片對波長為587. 6奈米之光線之折射率。 8 .如申請專利範圍第丨項所述之投影鏡頭，其中，該第二鏡群從放大端至縮小端依次包括：具有正光焦度之第五鏡片具有負光焦度之第六鏡片'具有正光焦度之第七鏡片及具有正光焦度之第八鏡片。 β 9 .如申請專利範圍第8項所述之投影:鍊頭㈠其中，該投影鏡頭還包括一個設置於該第五鏡片及第关鏡片之間之光闌。 10 ,如申請專利範圍第1項所述之技影i竟頭，其中，該第二鏡群包括至少一個非球面鏡片。 11 .如申請專利範圍第1項所述之投影鏡頭，其中，該第二鏡群包括至少一個塑膠非球面鏡片。 12 ·如申請專利範圍第1項所述之投影鏡頭，其中，該第二鏡 | 群包括至少一個鏡片滿足條件式： vd>60; 其中’ vd為波長為587. 6奈米之光線在該至少一個鏡片之阿貝數。 096132558 表單編號A0101 第24頁/共31頁 0993252430-04. The projection lens of claim 1, wherein the first mirror group comprises, in order from the enlarged to the reduced end, a first lens having a negative power, a second lens having a positive power, having a third lens of negative power and a fourth lens having positive power. 5. The projection lens of claim 1, wherein the first mirror group comprises at least one aspherical lens. 6. The projection lens of claim 1, wherein the first mirror group comprises at least one plastic aspherical lens. 7. The projection lens of claim 1, wherein the first mirror 096132558 form number A0101 page 23 / total 31 page 0993252430-0 1338155 099 July 14 press positive replacement page group includes at least one The lens satisfies the conditional formula: vd>55;nd>l.5; wherein, vd is the Abbe number of the light having a wavelength of 587.6 nm in the at least one lens, and nd is the wavelength of the at least one lens pair of 587. The refractive index of the light. 8. The projection lens of claim 2, wherein the second lens group comprises, in order from the amplification end to the reduction end, a fifth lens having a negative power with a positive power having a negative power. The seventh lens of positive power and the eighth lens with positive power. [beta] 9. The projection of claim 8, wherein the projection head further comprises an aperture disposed between the fifth lens and the second lens. 10, as claimed in claim 1, wherein the second mirror group comprises at least one aspherical lens. 11. The projection lens of claim 1, wherein the second mirror group comprises at least one plastic aspherical lens. The projection lens of claim 1, wherein the second mirror group comprises at least one lens satisfying a conditional expression: vd >60; wherein 'vd is a light having a wavelength of 587. 6 nm. Abbe number of at least one lens. 096132558 Form No. A0101 Page 24 of 31 0993252430-0